Sometimes when you are skiing, it can also be snowing. When it is snowing, the sky is white, the ground is white, the clouds (which you are in) are white. A big glowing red line in the HUD would delineate the piste from the off piste, and perhaps stop you accidentally skiing off a cliff in bad vis. Things that stop me killing myself I generally consider "useful" and not "part of the video game".
Similarly, if you're on a long piste, is that bloke in the black 1km downhill your mate, or just another person wearing black. Did they go left or right at the junction? Which restaurant were we skiing to again*?
Plus, skiing isn't necessarily sport, it's just spending some nice time in the mountains moving from place to place on skis. It's not all Ski Sunday grand slalom races y'know.